This is the mini USB meter. It can measure voltage, current, power and capacity. It can clearly display all the data. Can easily measure the USB ( PC USB, cell phone charger, car charger , mobile power , etc. ) port and device operating current and the output voltage charge-discharge capacity, performance, and judge the performance of the charging cable charging equipment, this tester can meet the requirements ! Fit to factories, laboratories and personal use, wide range and Easy to use, easy to take alone, no additional power supply, Plug and play.